Jetstar Qld flight forced to land in Guam

A Jetstar flight carrying 309 people bound for the Gold Coast has been forced to land on the Pacific island of Guam due to safety concerns.

Flight JQ12 from Narita, Japan, was diverted to Guam on Sunday after the aircraft displayed an indicator message relating to oil pressure, Jetstar said in a statement.

The pilot turned off one engine after seeing the oil pressure message.

Boeing 787s can fly safely on one engine, Jetstar said.

The Australian Transport Safety Bureau says it's gathering more information on the unplanned landing but is yet to decide if it will investigate.

The discount airline stressed it was a "priority" landing, not an "emergency" landing.

"(This) relates to the urgency with which a flight would have to land, including how the local air traffic control responds," a spokeswoman said.

"In this case the landing was precautionary, it wasn't an emergency."

At least one disgruntled passenger vented on social media.

Teagan Lowe tweeted "Get your s*** together @JetstarAirways ... we have been stranded in Guam for 10 hours w/no updates. What's going on?!?"

Jetstar said alternative travel arrangements are being made for passengers who will arrive on the Gold Coast on Monday morning.